Abstract: In this work, a high slew rate CMOS operational amplifier (op-amp) having moderate speed is presented which operates at supply voltage of 1.8 V (rail to rail) using TSMC 0.18 mm CMOS technology. Current buffer compensation strategy in conjunction with Miller compensation is used to achieve high speed and high slew rate. In this design, a tradeoff between speed and power dissipation is maintained. The op-amp is designed to exhibit a unity gain frequency of 1.1 GHz and gives a gain of 60 dB with a 57.50° phase margin. The proposed design exhibits a higher unity gain bandwidth and slew rate as compared to other conventional methods at the same load [1], [2]. This opamp is designed for high speed applications where a higher slew rate is required.

• Publication Date: 09-Jul-2012
• DOI: 10.15224/978-981-07-2950-9-9955
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Abstract: Effective management of water resources is of key concern in cropping systems in semiarid and arid areas. Distributed sensor-based irrigation systems provide an efficient solution to support site-specific irrigation that allows farmers to maximize their crop growth along with saving water. This paper describes details of the design and instrumentation of a smart automated irrigation, that supports a wireless sensor network, a memory storage for storing the details of the crop and the soil type, and software for real-time sensing and control of a site-specific precision move irrigation system. Field conditions were site-specifically monitored by field sensor maintained in the smart irrigation device based on a soil property map, and periodically sampled and wirelessly transmitted to a base station. An embedded systems based, irrigation machine was converted to be electronically controlled by a programming logic controller that gets updates from a remote Global Positioning System (GPS) a

• Publication Date: 09-Jul-2012
• DOI: 10.15224/978-981-07-2950-9-9959
• Views: 0
• Downloads: 0